Cylinder relief-valve.



PATEN-TED JUNE 2, 1903.

A. J. G. E. BERG. CYLINDER RELIEF VALVE.

APPLICATION FILED APR. 14, 1902.

N0 MODEL UNITED I STATES Patented June 2, 1903. Y PATENT OFFICE.

ANTON JULIUS eusTAv EDWARD BERG, or COPENHAGEN,DENMARK.

CYLINDERJRELIEF-VALVET SPECIFIOATION fQrming part of Letters iPawnt No. 730,085, dated June 2, 1903. Application filed April 14, 1902. Serial No. 102,691. (No model.)

To all whom it mag concern.- Be it known that I, ANTON JULIUS GUSTAV EDWARD BERG, a subject'of Christian IX,

tion of my steam-trap. Fig. 2 is a vertical section thereof as shown in Fig. 1. Fig. 3 is a View in horizontal cross-section. Fig. 4 is a view on the line 4 4 ofFig. 5. Fig. 5 is'a View in elevation of the valve and stem. Fig.- 6 is a face view of the valve-head".

Referring to the drawings, A represents the casing of my device. It is formed, essentially, to provide the central chamber a, the two exterior chambered passages a, and the connecting-ports (L The exterior passages o'- are of sufficient depth to permit of the movement of the reciprocating valves, of which I shall hereinafter make mention, and

also to receive, respectively, the ends of the pipes B, connecting the two exterior passages, and so'the chamber a, with the opposite ends of a steam-cylinder, that the water of condensation from either end of the cylinder may pass through the pipes B into and through the exterior. passages to the central chamber, from which it escapes through its The pipes B make jointed connection with the casing by means of the couplings b, which screw upon the threaded end surfaces 0, of the casing, and by their inturned edges b, clamped against the flanges ber a and the exterior pipes and passages isclosed by the valves 0 YO, resting against their respective valve-seats 0, cut in the in-i terio r wall of the casing at the entrance to the ports'aF. The valves are alike in their construction and are contained in that section of the exterior passages a which comprises the valve-chambers c, of a width sufficient that an annular passage will be left between the valve-head and the wall of the chamber and of sufficient depth to permit of the reciprocation of the valve as it moves from a closed to an open position, the ends of the pipes B preventing any undue longitudinal movement.

The valves are so guided in their reciprocatory movement that when closed they may rest securely against their valve-seats by their valve-stems 0 extending between the guiding-walls of the parts a and into the interior of the central chamber.

The valve-stems a have the hollow formation of a tube, and each receives the end sections of a spring 0 so compressed that it bears against the bottoms of the tubular stems with a tension sufficient to force the,

(See Fig. 2.); The normal position of the two valves is; therefore open. Communicationistheumade' "possible between the valve-chambers and valves from their valve-seats.

the centralchamber a through the hollow inselves. Inlet-passages 0 open from the valveecliambers into the interior of thevalvestems and the outlet-passages open from 'the' interior of the valve-stem into the central chamber and its outlet a As before explained, the exterior. passages a, which receive the ends of the pipes B, 1

provide also the valve-chamber c, which con- ;tainst'he reciprocating valves. These valves if the tension of the spring which forces them -from their valve-seats be sufficient, as is commonly the case withone when the other is closed,are thrown back against the ends of the "pipes B, and so would close up their outlets.

terior of the valve-stems, for the ports a are entirely closed b'y-the valve-stems them- This is provided for by the grooved recess 0 cut across the headed end surface of each valve and of a depth sufficient to insure a permanent communication between each pipeoutlet and the corresponding valve-chamber whatever the relation between the pipe ends and the valve-heads may be. When the valves are open, therefore, there is secured a continuous open passage from the pipes B to the outlet a and in this connection it is to be observed that when one of the valves is held closed this has no effect upon the other valve except forcing it to a still wider opening by the increased tension upon the connecting-spring. Upon the release of the closed valve it is forced back from its valveseat by the tension of the spring, and both valves resume their normal open position. It is evident, therefore, that a valve can become closed only upon pressure against it suflicient to overcome the tension of the resisting-spring, and when this pressure is relieved the valve immediately is forced back to its normal open position whatever the position of the other valve may be.

The operation of my steam-trap is as follows: Assuming the pipes B to be in communication with the two corresponding ends of a cylinder the piston of which is at rest, no steam being admitted into the cylinder, any accumulation of condensed water on either side of the piston would simultaneously pass ofi through the connecting-pipes B into the valve-chambers c of the steam-trap. The valves 0 C being open, for they are normally kept open by the tension of the spring C the water wouldthen flow through the inlet-passages a into the interior of the valvestems, through which it would pass, and then out through the outletpassages c, or even the end of the valve-stem, into the central chamber a and to its outlet a Upon the admission of steam-to the cylinder the valve in the steam-trap corresponding with the side of the cylinder into which the steam has been admitted is immediately closed against its seat by the steam-pressure. This may be seen by reference to Fig. 3, where the valve 0 is shown in closed position. This closing of the valve prevents further passage of the steam and has no effect upon the other valve except possibly to force it to a still wider opening through increased tension upon the connecting-spring. The water of condensation then passes off from the free end of the cylinder and, as before described, in case the valvehead has been forced back against the end of pipe 13 the passage of the water from the pipe into the valve chamber is aided by the grooved recess 0 cut across the head ofthe valve. Upon a reverse movement of the piston the pressure of steam in the other end of the cylinder simply occasions a reverse action of the steam-trap. The valve 0 on the side of the steam-pressure is then closed, while the pressure upon the Valve 0 being relieved it resumes its normal open position and the water of condensation passes off from that corresponding end of the cylinder. When the piston is at rest, therefore, the water of condensation will be let 01f from both sides of the piston; but when the piston is in motion the condensed water will then during further working of the engine be let off from one side of the piston at a timenamely, the side opposite where the steam is entering the cylinder. It will therefore be impossible for condensed water to accumulate in the cylinder, and a uniform and noiseless working of the engine is insured, while at the same time, the device being wholly automatic in its action,interruptions in the working are avoided.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. In relief-valves for steam-cylinders, the combination of a casing having a central chamber with an outlet, exterior passages leading to connect with the corresponding ends of a steam-cylinder, ports connecting said passages with the said central chamber, outwardly-opening valves within said pas= sages seated at the entrance to said ports and having stems passing through the Walls there= of, which stems are of sufficient length to contact with each other within said central chamber and whereby one valve may be forced open as the other becomes closed, and yield ing means for normally holding both valves open, but which permits of their alternate closure by steam-pressure from the corre sponding ends of the steam-cylinder.

2. In relief-valves of the character specifled, the combination of a casing having a central chamber with an outlet, exterior passages leading to connect with the corresponding ends of a steam-cylinder, ports connecting said passages with said central passages seated at the entrance to said ports and having stems passing through the walls thereof,- which stems are of sufficient length to contact with each other within said central chain ber and whereby one valve may be forced open when the other becomes closed, and a tension-sprin g located between the said valves for keeping both valves simultaneously pressed back to a normal open position, but which spring is of such tension that the valves may be alternately closed by steam-pressure from the corresponding ends of the steamcylinder.

3. In relief-valves of the character specified, the combination of acasing having a central chamber with an outlet, exterior passages leading to connect with the corresponding ends of a steam-cylinder, ports connecting said passages with the said central chamber, outwardly-opening valveswithin said passages seated at the entrance to said ports and having hollow stems passing through the walls thereof, which stems are of sulficient length to contact at their ends with each 730,085 a r 3 I other within said central chamber and whereby one valve may be forced open when the other is closed, a tension-spring interposed between said valves and contained within their hollow stems, which spring normally holds the valves openpressed back from their valve-seats, but the tension of which is such that the valves maybecome alternatelyclosed, substantially as described.

ANTON JULIUS GUSTAV EDWARD BERG.

In presence of- J OHN' JACQUES, J. C. J ACOBSEN. 

